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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans $ 557,356 $ 606,576 $ 703,837 $ 762,998
Non-PCI loans 24,906,429 24,916,700    
Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 269,913 296,672    
Non-PCI loans 16,140,020 16,137,227    
Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 804,463 757,854    
Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 10,747,715 10,717,234    
Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 427,419 426,985    
Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 3,879,575 3,938,730    
Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 280,848 296,424    
Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 287,443      
Non-PCI loans 8,766,409 8,779,473    
Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 258,959 257,030    
Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans   309,904    
Non-PCI loans 4,303,137 4,265,687    
Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 2,469,898 2,542,975    
Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 1,734,415 1,713,781    
PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 557,356      
PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 255,145      
PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans   268,280    
Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 142,668 134,882    
Current loans 24,763,761 24,781,818    
Non-PCI loans 24,906,429 24,916,700    
Non-PCI Loans | Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 46,175 35,619    
Current loans 16,093,845 16,101,608    
Non-PCI loans 16,140,020 16,137,227    
Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,085 969    
Current loans 803,378 756,885    
Non-PCI loans 804,463 757,854    
Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 27,740 19,503    
Current loans 10,719,975 10,697,731    
Non-PCI loans 10,747,715 10,717,234    
Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,715 467    
Current loans 425,704 426,518    
Non-PCI loans 427,419 426,985    
Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 15,498 14,306    
Current loans 3,864,077 3,924,424    
Non-PCI loans 3,879,575 3,938,730    
Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 137 374    
Current loans 280,711 296,050    
Non-PCI loans 280,848 296,424    
Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 96,493 99,263    
Current loans 8,669,916 8,680,210    
Non-PCI loans 8,766,409 8,779,473    
Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,158 2,193    
Current loans 256,801 254,837    
Non-PCI loans 258,959 257,030    
Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 54,314 50,904    
Current loans 4,248,823 4,214,783    
Non-PCI loans 4,303,137 4,265,687    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 25,748 28,706    
Current loans 2,444,150 2,514,269    
Non-PCI loans 2,469,898 2,542,975    
Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 14,273 17,460    
Current loans 1,720,142 1,696,321    
Non-PCI loans 1,734,415 1,713,781    
30 to 59 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 8,565      
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans   11,155    
30 to 59 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 80,658 76,187    
30 to 59 Days past due | Non-PCI Loans | Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 27,754 24,747    
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 617 516    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 16,120 14,200    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,198 91    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,706 9,655    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 113 285    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 52,904 51,440    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 581 581    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 33,623 28,239    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,734 12,585    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 7,966 10,035    
60 to 89 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,449      
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans   7,708    
60 to 89 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 27,040 19,682    
60 to 89 Days past due | Non-PCI Loans | Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 12,024 3,910    
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 262 9    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 8,818 2,066    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 517 76    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,403 1,759    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 24 0    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 15,016 15,772    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 28 21    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 7,760 7,357    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,227 4,490    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,001 3,904    
90 Days or greater | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 20,284      
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans   22,761    
90 Days or greater | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 34,970 39,013    
90 Days or greater | Non-PCI Loans | Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 6,397 6,962    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 206 444    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,802 3,237    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 300    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,389 2,892    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 89    
90 Days or greater | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 28,573 32,051    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,549 1,591    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 12,931 15,308    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,787 11,631    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans $ 3,306 $ 3,521